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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
The muscle is attached to a flat, strong tendon that is connected to the shoulder joint capsule. Along with the deltoid and pectoralis major muscles, the supraspinatus muscle helps initiate horizontal abduction (raising the arms skyward) of the shoulder.